Writing and saying the date in British English (Day-Month-Year), 21-12-1140 = 21st December, 1140:

the twenty-first of December, eleven forty

Note:

You can place AD (or CE) before or after the year or BC (BCE) after the year. AD = Anno Domini (Latin phrase for "in the year of the Lord"). 1 AD is considered the year in which Jesus Christ was born. Example: the current year, 2018, is: 2018 AD. BC = Before Christ; years before 1 AD. There is no year zero, neither AD nor BC. Nowadays CE and BCE are also used. CE = Common Era, instead of AD The year 1 CE = The year AD 1 (or 1 AD). BCE = Before the Common Era, instead of BC

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